Which of the following statements is a result of signal amplification? Multiple
ID: 161660 • Letter: W
Question
Which of the following statements is a result of signal amplification?
Multiple Choice
A.) Different types of cells will have differing reactions to a particular signal molecule.
B.) Small concentrations of extracellular signaling molecules can affect a rapid response from a cell.
C.) Endocrine signaling is made possible by signal amplification.
D.) Only high concentrations of extracellular signaling molecules can affect a rapid response from a cell.
E.) All cell types will react similarly to a particular signal molecule.
Explanation / Answer
Answer: (A) Different types of cells will have differing reactions to a particular signal molecule.
A single signal molecule often has different effects on different target cells. The neurotransmitter acetylcholine, for example, stimulates the contraction of skeletal muscle cells, but it decreases the rate and force of contraction in heart muscle cells.
B.) Small concentrations of extracellular signaling molecules can affect a rapid response from a cell.
Multistep pathways allows a small number of extracellular signaling molecules to be amplified to produce a large cellular response and also provide opportunity for regulation and coordination.
(C) Endocrine signaling is made possible by signal amplification.
Three components all cell signaling types have in common are: target cell, receptor and signal. The signaling cascade is useful because it amplifies the specefic response.
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